What Is This One?

This pen recently ended on ebay. It did not seem to draw much attention, but I am wondering what it is. The clip is non-Esterbrookish (is that a word?) and the two-tone cap is definitely different. A colored cap on a sold barrel can be explained easily. Is it a repair job of some sort? Here's a link to a picture:

San Francisco International Pen Show - They have dates! August 23-24-25, 2019 AND August 28-29-30, 2020. Book your travel and tables now! My PM box is usually full. Just email me: my last name at the google mail address.

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